198 lines
6.5 KiB
Groff
198 lines
6.5 KiB
Groff
.\" Automatically generated by Pod::Man 2.23 (Pod::Simple 3.22)
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.\" ========================================================================
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.\"
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.IX Title "SSL_connect 3"
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.TH SSL_connect 3 "2012-05-10" "1.0.1c" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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SSL_connect \- initiate the TLS/SSL handshake with an TLS/SSL server
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/ssl.h>
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\&
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\& int SSL_connect(SSL *ssl);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fISSL_connect()\fR initiates the \s-1TLS/SSL\s0 handshake with a server. The communication
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channel must already have been set and assigned to the \fBssl\fR by setting an
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underlying \fB\s-1BIO\s0\fR.
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.SH "NOTES"
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.IX Header "NOTES"
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The behaviour of \fISSL_connect()\fR depends on the underlying \s-1BIO\s0.
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.PP
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If the underlying \s-1BIO\s0 is \fBblocking\fR, \fISSL_connect()\fR will only return once the
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handshake has been finished or an error occurred.
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.PP
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If the underlying \s-1BIO\s0 is \fBnon-blocking\fR, \fISSL_connect()\fR will also return
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when the underlying \s-1BIO\s0 could not satisfy the needs of \fISSL_connect()\fR
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to continue the handshake, indicating the problem by the return value \-1.
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In this case a call to \fISSL_get_error()\fR with the
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return value of \fISSL_connect()\fR will yield \fB\s-1SSL_ERROR_WANT_READ\s0\fR or
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\&\fB\s-1SSL_ERROR_WANT_WRITE\s0\fR. The calling process then must repeat the call after
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taking appropriate action to satisfy the needs of \fISSL_connect()\fR.
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The action depends on the underlying \s-1BIO\s0. When using a non-blocking socket,
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nothing is to be done, but \fIselect()\fR can be used to check for the required
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condition. When using a buffering \s-1BIO\s0, like a \s-1BIO\s0 pair, data must be written
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into or retrieved out of the \s-1BIO\s0 before being able to continue.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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The following return values can occur:
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.IP "1." 4
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The \s-1TLS/SSL\s0 handshake was successfully completed, a \s-1TLS/SSL\s0 connection has been
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established.
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.IP "2." 4
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The \s-1TLS/SSL\s0 handshake was not successful but was shut down controlled and
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by the specifications of the \s-1TLS/SSL\s0 protocol. Call \fISSL_get_error()\fR with the
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return value \fBret\fR to find out the reason.
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.IP "3." 4
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<0
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.Sp
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The \s-1TLS/SSL\s0 handshake was not successful, because a fatal error occurred either
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at the protocol level or a connection failure occurred. The shutdown was
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not clean. It can also occur of action is need to continue the operation
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for non-blocking BIOs. Call \fISSL_get_error()\fR with the return value \fBret\fR
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to find out the reason.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fISSL_get_error\fR\|(3), \fISSL_accept\fR\|(3),
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\&\fISSL_shutdown\fR\|(3), \fIssl\fR\|(3), \fIbio\fR\|(3),
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\&\fISSL_set_connect_state\fR\|(3),
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\&\fISSL_do_handshake\fR\|(3),
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\&\fISSL_CTX_new\fR\|(3)
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.SH "POD ERRORS"
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.IX Header "POD ERRORS"
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Hey! \fBThe above document had some coding errors, which are explained below:\fR
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.IP "Around line 49:" 4
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.IX Item "Around line 49:"
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You have '=item 0' instead of the expected '=item 2'
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.IP "Around line 55:" 4
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.IX Item "Around line 55:"
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Expected '=item 3'
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